feat: pre-flight check of agency bookings

addresses #869bqxr4q

src/Form/Model/BookingEditContext.php

@@ -13,6 +13,7 @@ class BookingEditContext
 {
     /**
      * @param array<int, ParticipantCardDataDto>|null $cardsData
+     * @param array<int, list<string>> $missingValueLabelsByParticipantIndex
      */
     public function __construct(
         public readonly BookingDto $bookingDto,
@@ -20,9 +21,10 @@ class BookingEditContext
         public readonly ?BookingMutabilityDto $mutableData,
         public readonly BookingSummaryDto $summaryData,
         public readonly ?array $cardsData = null,
+        public readonly array $missingValueLabelsByParticipantIndex = [],
         public readonly bool $isDirty = false,
         public readonly bool $isSubmitted = false,
-        public readonly bool $hasValidationErrors = false,
+        public readonly bool $hasBlockingValidationErrors = false,
     ) {
     }
 }